Дисертації з теми "Particle Reynolds Number"
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Vargas-Dilaz, Salvador. "Numerical simulations of hydrodynamic particle interactions at low particle Reynolds number." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/11500.
Повний текст джерелаStoos, James Arthur Leal L. Gary Leal L. Gary Herbolzheimer Eric. "Particle dynamics near fluid interfaces in low-Reynolds number flows /." Diss., Pasadena, Calif. : California Institute of Technology, 1988. http://resolver.caltech.edu/CaltechETD:etd-02022007-110333.
Повний текст джерелаStaben, Michelle Elizabeth. "Low-Reynolds-number particle transport in narrow channels for microfluidics and other applications." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3178360.
Повний текст джерелаHammer, Patrick Richard. "A Discrete Vortex Method Application to Low Reynolds Number Aerodynamic Flows." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1311792450.
Повний текст джерелаHashemi, Mohammadabad Saeed. "Collision efficiency of a pollutant particle onto a long cylinder in low Reynolds number fluid flow." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=24057.
Повний текст джерелаAssuming that the Reynolds number R based on cylinder radius b is very small but not zero ($R ll 1$), and the Reynolds number Re based on cylinder length l is of order unity, the force per unit length of the cylinder, correct to the order of R, is obtained, first for a general flow direction and then for the case of flow perpendicular to the cylinder axis. This is done by using the Naiver-Stokes equations in long slender bodies theory and applying matched asymptotic expansions in terms of the ratio $ kappa$ of radius to body length. Flow field around the cylinder is calculated and the equation of particle motion is developed by applying Newton's second law of motion. The initial particle velocity far from the cylinder is calculated analytically and the particle trajectory course is solved numerically as an initial value problem by using Richardson Extrapolation and the Bulirsch-Stoer method.
The collision Efficiency E is obtained by trial and error and is plotted against the dimensionless particle parameter p for different values of R (from 10$ sp{-6}$ to 1). The numerical calculations show that the curves have a tendency to move to the right and become like a straight-line as R gets very small. The points at which E is less than 0.005 are also predicted.
Clark, Thomas Henry. "Measurement of three-dimensional coherent fluid structure in high Reynolds number turbulent boundary layers." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/243622.
Повний текст джерелаUllah, Al Habib. "Advanced Measurements and Analyses of Flow Past Three-Cylinder Rotating System." Thesis, North Dakota State University, 2020. https://hdl.handle.net/10365/31833.
Повний текст джерелаBloxham, Matthew Jon. "The effects of vortex generator jet frequency, duty cycle, and phase on separation bubble dynamics /." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1760.pdf.
Повний текст джерелаNessler, Chase A. "Characterization of Internal Wake Generator at Low Reynolds Number with a Linear Cascade of Low Pressure Turbine Blades." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1270749309.
Повний текст джерелаSharma, Amit. "Effect of Vortex Shedding on Aerosolization of a Particle from a Hill using Large-Eddy Simulation." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1617105212418248.
Повний текст джерелаApsilidis, Nikolaos. "Experimental Investigation of Turbulent Flows at Smooth and Rough Wall-Cylinder Junctions." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/71713.
Повний текст джерелаPh. D.
Memory, Curtis Lynn. "Numerical Simulation of Vortex Generating Jets in Zero and Adverse Pressure Gradients." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2098.pdf.
Повний текст джерелаKim, JaeMo. "Dynamic simulation of suspended particles and drops at finite Reynolds numbers by dissipative particle dynamics /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.
Повний текст джерелаGhahremanian, Shahriar. "Near-Field Study of Multiple Interacting Jets : Confluent Jets." Doctoral thesis, Linköpings universitet, Energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-113259.
Повний текст джерелаSiu, Yam Wing. "Particle tracking in separated flows." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243911.
Повний текст джерелаBregulla, Andreas Paul. "Role of thermo-osmotic flows at low Reynolds numbers for particle driving and collective motion." Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-206615.
Повний текст джерелаGuo, Zhifeng. "Numerical methods for the motion of particles in low Reynolds number hydrodynamics." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24144.pdf.
Повний текст джерелаOhmura, Takuya. "Near-wall Dynamics of Active and Passive Particles at Low Reynolds Number." Kyoto University, 2018. http://hdl.handle.net/2433/232226.
Повний текст джерелаKüchler, Christian [Verfasser]. "Measurements of Turbulence at High Reynolds Numbers : From Eulerian Statistics Towards Lagrangian Particle Tracking / Christian Küchler." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2021. http://d-nb.info/1230138072/34.
Повний текст джерелаPalma, Moya Sergio Andrés. "Sedimentation of polydisperse particles at low Reynolds numbers in inclined geometries. Numerical and laboratory experiments." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/141016.
Повний текст джерелаEl transporte hidráulico de partículas a altas concentraciones es una tecnología ampliamente utilizada en la industria para transportar diferentes tipos de materiales granulares mediante la mezcla con fluidos, agua en la mayoría de los casos. En el primer capítulo de esta tesis, vamos a discutir los aspectos más importantes de la dinámica de las suspensiones. En particular, vamos a explicar la física de las suspensiones diluidas, suspensiones semi-diluidas y suspensiones concentradas. Adicionalmente, una revisión de la sedimentación de partículas será mostrada. La sedimentación es un proceso por el cual las partículas sólidas se separan de un líquido, generalmente bajo la acción de fuerzas gravitacionales. La sedimentación es una de las técnicas más antiguas conocidas utilizadas en la industria para limpiar fluidos o, alternativamente, para recuperar partículas. En el segundo capítulo, vamos a mostrar los resultados de un trabajo numérico experimental de sedimentación de partículas ligeramente polidispersas. Una serie de simulaciones numéricas y experimentos de sedimentación se han realizado para comprender los factores que controlan el ángulo final de una capa de sedimento estática formada por partículas cuasi-monodispersas que sedimentan en un contenedor inclinado. El conjunto de experimentos incluye varias combinaciones de la viscosidad del fluido, ángulo del contenedor y concentración de sólidos. Una comparación entre los experimentos y un conjunto de simulaciones numéricas en dos dimensiones muestra que el mecanismo físico responsable de la disipación de energía en el sistema son las colisiones entre las partículas. Los resultados proporcionan nuevos conocimientos sobre el mecanismo que establece la morfología de la capa de sedimento formada por la sedimentación de las partículas en el fondo de un contenedor inclinado. El seguimiento de la interfaz entre los sólidos de la suspensión y la zona clara de fluido revela que el ángulo final adoptada por la capa de sedimento muestra fuertes dependencias de la concentración inicial de partículas y la inclinación del recipiente, pero no la viscosidad del fluido dentro de un rago de números de Reynolds de partículas pequeños. Se concluye que (1) la función de escondimiento juega un papel importante en el ángulo de la capa de sedimentos, (2) la relación entre el efecto de fricción y la pendiente puede ser explicado como una función casi lineal de la velocidad proyectada a lo largo del fondo del contenedor, y ( 3) antes de la finalización de la sedimentación hay una interacción entre partículas significativa a través del fluido que afecta a la organización de la capa final. Podemos expresar la pendiente del lecho de sedimentos como una funci|ón de dos números adimensionales, una versión del número inercial y la concentración de partículas. Los presentes experimentos confirman algunos resultados anteriores sobre el papel del fluido intersticial en los flujos a bajos número de Stokes de partículas. Por último, vamos a mostrar los resultados de un trabajo numérico. Aquí, hemos utilizado un modelo de mezcla continuo para resolver numéricamente las ecuaciones de momento y continuidad asociadas con la dinámica de sedimentación de mezclas de líquido y sólido altamente concentradas en un conducto inclinado abajos números de Reynolds. El conjunto de simulaciones numéricas incluye varias combinaciones de la viscosidad del fluido, ángulo de conducto y concentración de partículas. Esta investigación tiene como objetivo mostrar la fenomenología y dinámica asociada a la sedimentación de partículas monodispersas bajo diferentes condiciones físicas y la caracterización de la etapa final de la capa de sedimento en dos tipos de geometrías inclinadas, con y sin una sección horizontal. Usando argumentos de escala, una expresión matemática formada por tres grupos a dimensionales, incluyendo el número inercial, la concentración de partículas y la relación entre el número de sedimentación Grashof para el número de Reynolds se propone para explicar la altura de la capa de sedimento en la zona de cambio de pendiente de un conducto. Además, encontramos que la concentración inicial es una variable muy importante para saber bajo qué condición es el conducto podría obstruirse. Los principales resultados de esta tesis se presentaron como dos artículos científicos, el primero publicado en el Journal Physics of Fluids, y el segundo trabajo bajo revisión en el International Journal of Multiphase Flow.
Esta tesis ha sido parcialmente financiada por Conicyt Beca de Doctorado Nacional N° 21110766
Hackl, Jason F. "Fixed-scale statistics and the geometry of turbulent dispersion at high reynolds number via numerical simulation." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41100.
Повний текст джерелаAscoli, Edward Paul Leal L. Gary Leal L. Gary. "The effects of a planar wall on the low Reynolds number motion of solid particles, drops and bubbles /." Diss., Pasadena, Calif. : California Institute of Technology, 1988. http://resolver.caltech.edu/CaltechETD:etd-11062007-130109.
Повний текст джерелаRivedal, Nikolai Hydle. "Two-dimensional Simulations of Particle Deposition on a Cylinder in a Turbulent Cross Flow at Intermediate Reynolds Numbers." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13994.
Повний текст джерелаSouzy, Mathieu. "Mélange dans les suspensions de particules cisaillées à bas nombre de Reynolds." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4719/document.
Повний текст джерелаMainly based on experiments, I investigated at a particle scale the mechanisms at the origin of the transfer enhancement in sheared non-Brownian and non-inertial particulate suspensions. First, I revisited Taylor's experiment, investigating the evolution of a drop of dye in a periodic shear. Beyond a critical strain amplitude, the presence of the particles breaks the reversibility of the system and the drop of dye is rapidly dispersed in the surrounding medium. Then, investigating the transfer process in the wall vicinity, I showed that in this region, the rotation of the particles convectively transport a scalar at a constant rate directly from the wall towards the bulk of the suspension, breaking the diffusive boundary layer. An analytical solution for the concentration profile in this region is proposed, in good agreement with experimental measurements. Lastly, high-resolution PIV measurements of the fluid phase were performed in the bulk of the suspension. Using these velocity fields, we reconstructed the stretching histories of fluid material lines to determine the stretching laws, crucial for the understanding of the mixing process. The presence of the particles changes the very nature of the stretching laws from linear, in a pure fluid, to exponential in the presence of particles. A multiplicative stretching model is proposed, which quantitatively predicts the experimentally measured evolution of the mean and the variance of the elongations of the fluid material lines as well as their evolution towards a log-normal distribution. The strong stretching inhomogeneity in sheared suspensions results in a broad distribution of the mixing time
Kantharaju, Jahnavi. "Large scale structures in the near field of turbulent round jets at high Reynolds numbers." Thesis, Institut polytechnique de Paris, 2021. http://www.theses.fr/2021IPPAX017.
Повний текст джерелаThis thesis aims at gaining fundamental understanding of the large scale structures in the near field of turbulent round jets. First, a specific interaction between vortex rings and streamwise vortices within the shear layer is explored. The result of this interaction is hypothesized to manifest itself in a radial organization of streamwise vortices, as opposed to the azimuthal one reported in the literature. High-speed stereo particle image velocimetry (HS-SPIV) is performed in a cross-sectional plane, two diameters downstream of the nozzle exit. The strength of the vortex rings is varied through axisymmetric (azimuthal wavenumber m=0) excitation and the resulting organization of streamwise vortices is monitored. It is found that as the relative strength between the rings and streamwise vortices increases, the organization of the latter vortices gradually shifts towards azimuthal array, thus corroborating the above mentioned hypothesis. The results confirm the influence of streamwise vortices on the weaker vortex rings formed in round jets at high Reynolds numbers. Next, a simple model is built to isolate and study the above interaction using numerical simulations. In this regard, first the evolution of an isolated vortex ring is studied. This ring is then placed in a mean shear of a jet. A comparison between the evolution of the ring in the presence and absence of shear provides insights into the role played by shear in the vortex ring breakdown.As a second part, the HS-SPIV data is further analyzed to characterize streaks in turbulent round jets, and their co-existence with vortex rings and streamwise vortices is explored. The results indicate that streaks are found in the outer edge of the shear layer where they remain almost steady, while the convecting system of vortex rings and streamwise vortices feed them by ejecting fluid outwards from the jet core. Strengthening the vortex rings through forcing is not seen to significantly alter the presence of the streaks, suggesting an almost decoupling between the two.At last, different m=0 modes in the near field of round jets are studied, to highlight the differences between the so-called “jet preferred mode” and the most-energetic mode (corresponding to the passage frequency of rings). Hot-wire anemometry measurements at different axial locations and the HS-SPIV data at two diameters indicate that the two modes have different radial structures. It is also found that exciting the jet at its most energetic mode could provide higher spreading rates than the jet preferred mode for the same input forcing level
Marchetti, Benjamin. "Sédimentation de particules : effets collectifs et filaments déformables." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0364/document.
Повний текст джерелаIn the first part, a jointed experimental and numerical study examining the influence of vortical structures on the settling of a cloud of solid spherical particles under the action of gravity at low Stokes numbers is presented. We use electro-convection to generate a two-dimensional array of controlled vortices which mimics a simplified vortical flow. Particle image-velocimetry and tracking are used to examine the motion of the cloud within this vortical flow. The cloud is modeled as a set of point-particles for which the hydrodynamic interaction is preponderant. The cloud behavior (trajectory, velocity, aspect ratio, break-up time …) is compared to the predictions of a two-way-coupling numerical simulation. In the second part, a jointed experimentally and numerical study on the dynamics of slender flexible filaments settling in a viscous fluid at low Reynolds number is presented. The equilibrium state of a flexible fiber settling in a viscous fluid is examined using a combination of macroscopic experiments, numerical simulations and scaling arguments. We identify three regimes having different signatures on this equilibrium configuration of the elastic filament: a weak deformation regime wherein the drag is proportional to the fiber velocity settling perpendicular to the gravity; a large deformation regime wherein the drag is proportional to the fiber velocity settling parallel to the gravity and an intermediate elastic reconfiguration regime where the filament deforms to adopt a shape with a smaller drag which is no longer linearly proportional to the velocity but to the square root of the velocity
Spiller, Martin Werner. "Physical and numerical experiments of flow and transport in heterogeneous fractured media : single fracture flow at high Reynolds numbers, and reactive particle transport." Phd thesis, kostenfrei, 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=975641778.
Повний текст джерелаSpiller, Martin [Verfasser]. "Physical and Numerical Experiments of Flow and Transport in Heterogeneous Fractured Media : Single Fracture Flow at High Reynolds Numbers, and Reactive Particle Transport / Martin Spiller." Aachen : Shaker, 2005. http://d-nb.info/1186587210/34.
Повний текст джерелаSpiller, Martin Werner [Verfasser]. "Physical and Numerical Experiments of Flow and Transport in Heterogeneous Fractured Media : Single Fracture Flow at High Reynolds Numbers, and Reactive Particle Transport / Martin Spiller." Aachen : Shaker, 2005. http://nbn-resolving.de/urn:nbn:de:101:1-2019051908320496307739.
Повний текст джерелаBregulla, Andreas Paul [Verfasser], Frank [Akademischer Betreuer] Cichos, Frank [Gutachter] Cichos, and Clemens [Gutachter] Bechinger. "Role of thermo-osmotic flows at low Reynolds numbers for particle driving and collective motion / Andreas Paul Bregulla ; Gutachter: Frank Cichos, Clemens Bechinger ; Betreuer: Frank Cichos." Leipzig : Universitätsbibliothek Leipzig, 2016. http://d-nb.info/1240482930/34.
Повний текст джерелаMachicoane, Nathanaël. "Particules matérielles en écoulement turbulent. Transport, dynamique aux temps longs et transfert thermique." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2014. http://tel.archives-ouvertes.fr/tel-01070651.
Повний текст джерелаBelkhelfa, Yazid. "Etude du comportement dynamique et du transfert de matière et de chaleur entre des particules sphériques et un écoulement laminaire ou turbulent." Phd thesis, INSA de Rouen, 2008. http://tel.archives-ouvertes.fr/tel-00560879.
Повний текст джерелаDekou, Tiomajou Raoul Florent. "Organisation à grandes échelles de la turbulence de paroi." Thesis, Ecole centrale de Lille, 2016. http://www.theses.fr/2016ECLI0006/document.
Повний текст джерелаThis study lies in the context of large scale coherent structures (uniform momentum regions and vortical motions) investigation in a near wall turbulent boundary layer at high Reynolds numbers (Reθ=9830 and Reθ=19660). With a Linear Stochastic Estimation procedure based on correlations computation, a full time-resolved 3 component field is reconstructed at high frequency from stereo-PIV at 4 Hz and hot wire data at 30 kHz . A DNS database of turbulent channel flow was used to validate the reconstruction method. To evaluate the quality of the method, reconstructed velocity fluctuations are compared to refence ones extracted directly from the DNS database. Furthermore, a statistical analysis is performed on HWA, PIV and LSE velocity fields. The results obtained are compared to those from Carlier and Stanislas (2005). Algorithms were developed to extract coherent structures from the reconstructed field. Uniform momentum regions are characterized with their mean hydraulic diameter in the YZ plane, their life time and their contribution to Reynolds stresses. The vortical motions are characterized by their position, radius, circulation and vorticity in addition to their life time and their number computed at a fixed position from the wall. The spatial organization of the structures was investigated through a correlation of their respective indicative functions in the spanwise direction . The simplified large scale model that arised is compared to the ones in the literature
Браженко, В. М. "Очищення робочих рідин повнопотоковим гідродинамічним фільтром з обертовим перфорованим циліндром та бункером для осаду". Thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/67879.
Повний текст джерелаIn the thesis the actual scientific and technical problem is solved – an increase in the efficiency of cleaning of working fluids from mechanical particles by a full-flow hydrodynamic filter, namely a rotational, in which it is proposed to use a rotating perforated cylinder as a filter element and a sludge hopper for collecting the separated particles. On the basis of numerical modeling based on the Navier-Stokes (RANS) averaged Reynolds equations using a shift model of the shifting stresses (SST k-ω model) of Menther, a study of the flow of a carrier fluid near the rotating filtering surface and the area of the rotor sink hopper filter. The uneven flow of a fluid in a radial direction through a perforated cylinder is proved. Through the openings located near the inlet to the working area there is more fluid than through the openings, which are as far removed from this section, which adversely affects the implementation of the hydrodynamic effect of cleaning. The evolution of the fluid flow along the holes along the surface of the perforated cylinder, depending on the change in the parameters Reφ, Rer, has been studied, and it is shown that with increasing Reφ, which characterizes the rotary motion of the liquid, the overlapping of the apertures with the incident flow increases. In the threedimensional form, the trajectories of the motion of suspended particles near the permeable surface of the filter element have been investigated, the hydrodynamic effect of purification for a perforated cylinder as a filter element has been proved under different flow regimes and the presence of a «buffer zone» is excluded, which excludes the contact of impurity particles with the penetrant cylinder surface. On the basis of an axisymmetric statement, the positive effect of the rotation of the end wall of the filter element on the hydrodynamics of the current, revealed in the containment of the diffusion of vortex zones from the bunker region to the working region of the filter, and the content of the particles in the hopper, was found. The dependence of the filter cleaning efficiency on the relative diameter and density of the particles of impurity and fluid density on the given filter design was obtained. The highest efficiency of the content of impurity particles in the bunker of the cylindrical and conical divergent configuration is determined. Experimental studies have been carried out to confirm the efficiency of 95 % of the proposed cleaning device from particles of 100…200 μm AMG-10 fluid and the adequacy of the obtained theoretical results to real physical processes. The difference between the calculated values and the resulting parameters obtained by the experiment was not more than 9 %.
Stoos, James Arthur. "Particle Dynamics near Fluid Interfaces in Low-Reynolds Number Flows." Thesis, 1988. https://thesis.library.caltech.edu/465/3/Stoos_js_1988.pdf.
Повний текст джерелаNumerical solutions for the creeping motion of a spherical particle in a linear axisymmetric straining flow normal to a deformable interface are presented for a range of viscosity ratios, capillary numbers and Bond numbers. The parameter ranges investigated have applications in areas of flotation (small interface deformation) and material processing (large interface deformation). The accuracy of previous solutions for flotation problems, which neglect interface deformation is considered, along with the magnitude and form of interface deformation "defects" that may appear in material processing applications involving fluids containing bubbles or small particles.
Numerical solutions for the equilibrium particle-interface configuration for a neutrally buoyant spherical particle contacting a deformable fluid/gas interface in a linear axisymmetric straining flow at low Reynolds number are presented for a range of contact angles and capillary numbers. These solutions may have applications both in flotation separation processes and in contact angle and surface tension measurement. In addition, the accuracy of simply combining previous results for particle detachment due to particle buoyancy with the results for particle detachment due to viscous forces is considered. The equilibrium configuration is especially sensitive to the inclusion of a small amount of flow for small contact angles and for capillary numbers near the critical capillary number.
Trajectories of small spherical particles around a spherical drop (bubble and solid) are calculated from an approximate solution employing a matched asymptotic expansion. Viscous interaction is seen to have a large effect on the trajectory around a solid collector and a small effect on the trajectory around a bubble. Previous solutions are found to be in error in their prediction of an increase in the capture efficiency because of viscous interactions; the capture efficiency decreases significantly in this case.
Finally, the trajectories of particles around bubbles and the capture of particles by bubbles is investigated experimentally.
Zeng, Lanying. "Interaction between a spherical particle and wall-bounded flows at finite Reynolds number /." 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3270066.
Повний текст джерелаSource: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4579. Adviser: S. Balachandar. Includes bibliographical references (leaves 188-195) Available on microfilm from Pro Quest Information and Learning.
Peng, HsiuChin, and 彭修慶. "Flow field at high incoming velocity and Reynolds number measurements using Particle Imaging Velocimetry." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/16111905132216223270.
Повний текст джерела國立臺灣大學
工程科學與海洋工程學系
91
This study aims to establish a P.I.V.(Particle Image Velocimetry)system by measuring the juncture vortex come up near the intersection of a circular cylinder and a flat plate in a recurring hydraulic tank. Two identifying particle methods ,(1)Using cross-correlation principle method and(2)an artificial neural network method are used to verify the practicality of this P.I.V. system. The result shows that the P.I.V. system can get a good quantitative analysis. The result also shows that the neutral network method had a better outcome to the measurement of juncture vortices than the using cross-correlation principle methods at lower incoming velocities, but the cross-correlation principle method identifies more particles than the neutral network method at higher incoming velocity conditions.
Ramirez, Lynnette E. S. "Dynamics Of A Spherical Particle In A Model Clinostat Or Bioreactor." Thesis, 2004. http://hdl.handle.net/10125/10492.
Повний текст джерелаNadge, Pankaj M. "High Reynolds Number Flow Over A Backward-Facing Step." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2542.
Повний текст джерелаNadge, Pankaj M. "High Reynolds Number Flow Over A Backward-Facing Step." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2542.
Повний текст джерелаSu, Yean Chen, and 蘇彥全. "Effects of particle residence time and Reynolds number on solid- liquid convection mass transfer coefficient in holding tubes." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/61552494483395228548.
Повний текст джерелаSharma, Deepan. "Steady Sedimentation of Particles in Long Vertical Tube and Effect of End Boundary Conditions on Convective Motion." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5637.
Повний текст джерелаBhat, Shantanu. "Study Of Stall Flutter Of An Isolated Blade In A Low Reynolds Number Incompressible Flow." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2443.
Повний текст джерелаBhat, Shantanu. "Study Of Stall Flutter Of An Isolated Blade In A Low Reynolds Number Incompressible Flow." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2443.
Повний текст джерелаKumar, Vijay. "Viscous Vortex Method Simulations of Stall Flutter of an Isolated Airfoil at Low Reynolds Numbers." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/2814.
Повний текст джерелаKumar, Vijay. "Viscous Vortex Method Simulations of Stall Flutter of an Isolated Airfoil at Low Reynolds Numbers." Thesis, 2013. http://etd.iisc.ernet.in/handle/2005/2814.
Повний текст джерелаForghani, Marveh. "Consolidation of large spherical particles at low Reynolds numbers." Thesis, 2015. http://hdl.handle.net/1959.13/1308128.
Повний текст джерелаThis study was concerned with the validation of a new theoretical model (Galvin et al., 2015) to describe sediment consolidation, focussing on systems having negligible surface and inertial forces, and hence a minimal compressive yield stress. The study was also concerned with providing a detailed description of this model and its relationship to other work.The particles were assumed to be homogeneous, incompressible and spherical, and to settle in accordance with Stokes` law. The model assumed that the material depositing onto the bed carried three quantities, a fixed portion of solids ΔS, a fixed portion of retained water ΔR, and a variable portion of water deemed to be expressible ΔW. The sediment bed consisted of a finite number of these distinct layers, each containing fixed quantities of the solids and retained water and a variable quantity of the expressible water. The hypothesis of this research was that the reduction in the volume of expressible water declines according to a simple scaling law, ΔW ∝ t-2. The model was used to describe the entire batch settling curve, concentration profile, and velocity of the particles within the sediment bed. An experimental system was developed to validate the model. Spherical particles of Sephadex were used to form suspensions of a given volume fraction. Conventional batch settling tests were performed, and the height data versus time compared with the model predictions. Other experiments were focussed on the movement of the particles during the consolidation, using a CCD camera to record the settling. Further data on the concentration profiles at different times, for experiments conducted at different volume fractions, were produced. Again very good agreement was achieved between the theory and the experimental data.
Wu, Chin-Liang, and 吳致良. "The Flow characteristics of an Interactive Particle at Low Reynolds Numbers." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/38737546489210645201.
Повний текст джерела國立海洋大學
機械與輪機工程學系
86
The influence of surrounding particle of different sizes, located at various distance and angles with respect to the mainstream direction, on the drag and the flow characteristics of test particle has been experimentally investigated. Quantitative data and physical interpretation are provided. For drag measurements, the liquid viscosity has been increased in an effort to enlarge the magnitudes of drag to a measurable range. The drags of an interactive particle can then be exactly determined by the help of a precise electronic balance. The flow field measurements are conducted using a non-intrusive LDA system. The refractive index matching technique is also applied to overcome the optical difficulty caused by the pass of laser beam through a curve surface. Based on the relationships between the drag and the wake strength derived for a non-interactive particle, empirical correlation has been developed to calculate the drags and the wake strength of an interactive particle. The flow properties under different interactive conditions can then be closely related. Through the above approaches, this study provides not only the important quantitative data of drag and flow characteristics of an interactive particle but also the deep physical understanding of how the particles interacting with each other.
Shekunov, Boris Yu, J. Baldyga, and Peter York. "Particle formation by mixing with supercritical antisolvent at high Reynolds numbers." 2001. http://hdl.handle.net/10454/3651.
Повний текст джерелаA precipitation process is considered in which completely miscible solution and supercritical antisolvent are passed through premixing and diluting zones of a turbulent flow. The influence of flow velocity on particle size and nuclei concentration is discussed in terms of mixing and precipitation time constants and their supersaturation dependencies. The proposed model allowed the major process parameters such as supersaturation profile, mixed fluid fraction and mean particle size to be calculated and compared with experimental data. For the crystallization system paracetamol/ethanol/CO2 studied, the supersaturation profile becomes established at Re104. The particle size and shape are defined, firstly, by increase of supersaturation and relative volume of mixed (on molecular scale) fluid with increase of flow velocity and, secondly, by decrease of residence time available for nucleation with increase of flow velocity. These competitive processes can result in minimum particle size at a defined flow rate.
Wakaba, Lulama V. "On the response of a spherical particle to unsteady flows at finite Reynolds numbers /." 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3250340.
Повний текст джерелаSource: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1043. Adviser: S. Balachandar. Includes bibliographical references (leaves 170-176) Available on microfilm from Pro Quest Information and Learning.